In Edit Options -> Station Handling, there is an option called ‘Station Delay Time’. It inserts a fixed delay between every two zones. The delay time is fixed regardless of the watering percentage. I know you have just one zone, but there is a work-around to achieve what you want: you split the one zone wires into 4, and connect those to zones 1, 2, 3, 4 respectively. Physically it’s just 1 zone, but logically it’s 4. That way, you can set a program to turn on zones 1, 2, 3, 4 (which physically correspond to the same zone), but it will insert the delay time between them.